Open AccessAn Introduction to the exFAT File System and How to Hide Data Within
Author(s) -
Julian Heeger,
York Yannikos,
Martin Steinebach
Publication year - 2022
Publication title -
journal of cyber security and mobility
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.198
H-Index - 9
eISSN - 2245-4578
pISSN - 2245-1439
DOI - 10.13052/jcsm2245-1439.1125
Subject(s) - computer science , steganography , file system , metadata , focus (optics) , information hiding , embedding , file format , computer file , database , information retrieval , data mining , operating system , artificial intelligence , physics , optics
In the recent years steganographic techniques for hiding data in file system metadata gained focus. While commonly used file systems received tooling and publications the exFAT file system did not get much attention – probably because its structure provides only few suitable locations to hide data. In this work we present an overview of exFAT’s internals and describe the different structures used by the file system to store files. We also introduce two approaches that allow us to embed messages into the exFAT file system using steganographic techniques. The first approach has a lower embedding rate, but has less specific requirements for the embedding location. The other one, called exHide, uses error correcting to allow for an more robust approach. Both approaches are specified, evaluated and discussed in terms of their strengths and weaknesses.